dynamic triangulation of a mesh possible?

[herbk]

Hi,
sveral times i want to show the airflow around airfoil it's above the stall angle. To have e nice view i create a big box where the airfoil is placed inside. If i create the mesh, i can set the max triangle size. If a use a big value the calkulation is quick, but at paraview the airfoil looks not realy likea airfoil. If use a smaler value it looks better at paraview, but still not realy good at a max size of 5mm, but the time to calculate the mesh is going up, - off course.

Is there somwhere a setting to create a mesh which has little triangles around the object's contours, but getting bigger with the distance to it?

Here a screenshot of a airfoil created with 5mm max teiangle size at Paraview

profile_zoom.jpg (21.29 KiB) Viewed 856 times

Especially at the LE, the most important part of an airfoil, the triangulation is very pronounced und im worry that it falsifies the shown airflow to.


OS: openSUSE Leap 15.1 (KDE//usr/share/xsessions/plasma5)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.18811 (Git) AppImage
Build type: Release
Branch: master
Hash: b809867021deb37be1039dab37b9fe1cafab254e
Python version: 3.7.3
Qt version: 5.12.5
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: German/Germany (de_DE)

BTW: Is there somwhere a manual which parameters are changing what? Since the new UI there are a lot of changable values at the Data box, but not much at the UI Popups...

[thschrader]

Hi Herbert,
you can use the mesh-refinement options for mesh-design.
In this case:cfmesh. Works with gmsh/snappyhexmesh too (but without boundary-layers...)
example cfmesh:

naca2412.FCStd

(171.78 KiB) Downloaded 63 times

done with:
OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.15860 (Git)
Build type: Release
Branch: master
Hash: 3b708c7f84b0425076b520e1d95627b20fd75fe0
Python version: 2.7.14
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.2.0
Locale: German/Germany (de_DE)

mesh_refinement.JPG (118.17 KiB) Viewed 792 times

cfmesh_with_boundary_layers.JPG (142.79 KiB) Viewed 792 times